RE: How to "test run" an engine?
Hi
Well, suppose if you bolt it down nice and firm you could attach a 9X6 or a 9x7 prop on it and start it just like any other plane engine.
To prime it, just close the carb with your thumb, us a chicken stick and flip it over smartly 3 or 4 times to get some fuel in the carb. Open the needle valve about 2 turns from fully closed, attach your glowdriver and then with the throttle about 1/3rd open flip it over and see if it starts.
Marcel